An Earned Schedule-based regression model to improve cost estimate at completion. Narbaev, T. & De Marco, A. International Journal of Project Management, 32(6):1007–1018, August, 2014. 00003![An Earned Schedule-based regression model to improve cost estimate at completion [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex Traditional Earned Value Management (EVM) index-based methods for Cost Estimate at Completion (CEAC) of an ongoing project have been known for their limitations inherent with both the assumption that past EVM data is the best available information and early-stage unreliability. In an attempt to overcome such limitations, a new CEAC methodology is proposed based on a modified index-based formula predicting expected cost for the remaining work with the Gompertz growth model via nonlinear regression curve fitting. Moreover, the proposed equation accounts for the schedule progress as a factor of cost performance. To this end, it integrates into its equation an Earned Schedule-based factor indicating expected duration at completion. The proposed model shows itself to be more accurate and precise in all early, middle, and late stage estimates than those of four compared traditional index-based formulae. The developed methodology is a practical tool for Project Managers to better incorporate the progress status into the task of computing CEAC and is a contribution to extending EVM research to better capture the inherent relation between cost and schedule factors.
@article{narbaev_earned_2014,
title = {An {Earned} {Schedule}-based regression model to improve cost estimate at completion},
volume = {32},
issn = {0263-7863},
url = {http://www.sciencedirect.com/science/article/pii/S0263786313001798},
doi = {10.1016/j.ijproman.2013.12.005},
abstract = {Traditional Earned Value Management (EVM) index-based methods for Cost Estimate at Completion (CEAC) of an ongoing project have been known for their limitations inherent with both the assumption that past EVM data is the best available information and early-stage unreliability.
In an attempt to overcome such limitations, a new CEAC methodology is proposed based on a modified index-based formula predicting expected cost for the remaining work with the Gompertz growth model via nonlinear regression curve fitting. Moreover, the proposed equation accounts for the schedule progress as a factor of cost performance. To this end, it integrates into its equation an Earned Schedule-based factor indicating expected duration at completion. The proposed model shows itself to be more accurate and precise in all early, middle, and late stage estimates than those of four compared traditional index-based formulae.
The developed methodology is a practical tool for Project Managers to better incorporate the progress status into the task of computing CEAC and is a contribution to extending EVM research to better capture the inherent relation between cost and schedule factors.},
number = {6},
urldate = {2015-02-02},
journal = {International Journal of Project Management},
author = {Narbaev, Timur and De Marco, Alberto},
month = aug,
year = {2014},
note = {00003},
keywords = {Cost estimate at completion, Earned Value Management, Earned schedule, Regression analysis},
pages = {1007--1018},
}
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